Unify notification routing and escalation

Design unified alert routing across GitHub, Linear, desktop, and hook surfaces

Collapsing fragmented alerts into one operator-focused lane with clear ownership and action

• · current notification sources and channels
• · severity classification rules

• · consolidated routing plan
• · deduplication rules
• · operator action workflows

Existing notification sources documented (GitHub, Linear, hooks, etc.)

Cannot auto-detect all notification sources; severity model requires user input

• · severity model with interrupt vs. digest rules
• · duplicate detection across multiple surfaces